Electronic ballast for operating at least one first cascade of LEDs and one second cascade of LEDs
US9380674B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2013 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Jan 22, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast may include: a rectifier; a first unit including a first cascade of LEDs and a first storage capacitor connected in parallel with the first cascade; a second unit including at least a second cascade of LEDs and a second storage capacitor connected in parallel with the second cascade; wherein the second unit includes a diode coupled in series with the parallel circuit including the second cascade; wherein the electronic ballast includes: a current controller with an actual value input and a setpoint value input, a setpoint value presetting apparatus for the current through the cascades, wherein the setpoint value presetting apparatus is designed to provide a setpoint value at the setpoint value input which is proportional to the voltage at the output of the rectifier; a first actuating element; wherein the controller includes a drive output coupled to the first actuating element and a second actuating element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.